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Related Experiment Videos

Experimental studies of sewer exfiltration.

J B Ellis1, D M Revitt, P Lister

  • 1Urban Pollution Research Centre, Middlesex University, Bounds Green Road, London N11 2NQ, UK. B.Ellis@mdx.ac.uk

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 2, 2003
PubMed
Summary

In sewers, joint openings increase water exfiltration, but in-pipe sediment can seal these leaks. Sediment type, like organic material and toilet tissue, significantly impacts sealing effectiveness and exfiltration rates.

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Area of Science:

  • Environmental Engineering
  • Wastewater Management
  • Fluid Mechanics

Background:

  • Wastewater exfiltration from sewer systems is a significant environmental concern.
  • Joint integrity and internal pipe conditions, such as sediment buildup, influence leakage rates.
  • Understanding these factors is crucial for effective sewer management and infrastructure maintenance.

Purpose of the Study:

  • To investigate the impact of joint openings and in-pipe sediment on sewer exfiltration losses.
  • To evaluate how flow and hydraulic head affect exfiltration rates under different conditions.
  • To assess the effectiveness of simple tracer techniques for quantifying exfiltration and potential tracer adsorption.

Main Methods:

  • Conducting experimental tests on a model sewer system.

Related Experiment Videos

  • Varying hydraulic head and flow conditions during clean-water and sediment-laden tests.
  • Utilizing tracer techniques to measure exfiltration volumes.
  • Analyzing the physical and chemical properties of in-pipe sediment.

    • Main Results:

    • Exfiltration rates showed exponential relationships with head in clean-water tests.
    • Sedimentation altered exfiltration to power-law functions with respect to head.
    • Organic sediment, particularly with shredded toilet tissue, effectively sealed joint openings.
    • Tracer adsorption by pipe solids was evaluated for its impact on loss quantification.

    Conclusions:

    • In-pipe sediment can significantly reduce exfiltration, acting as a natural sealant.
    • The sealing effectiveness depends on the sediment's composition, with organic materials being more effective.
    • Tracer methods are viable for quantifying exfiltration, but potential adsorption must be considered.